Cow Parsnip
    Heracleum maximum
    From Nearctica
    Identification: Plant large, hairy, with a bad smell. Flowers white,   in a large, diffuse umbel. Petals notched, sometimes tinted with violet. Stems   hollow, up to 2 inches in diameter at the base. Leaves large, palmate, heavily   toothed or divided into three segments. Base of leaf expanded, clasping the stem   as in celery. Plant 4 to 10 feet in height.
    Distribution: Throughout most of North America except the southeastern   United States.
   
  
    
    
      Habitat: Cow Parsnip is found on a variety of rich, wet habitats such   as moist meadows.
      Flowering period: June to August.